Unit Economics Calculator
Series A/B Growth ViabilityCEO/Founder Context: Your valuation depends on these numbers. If your LTV:CAC is under 3.0, you are burning cash inefficiently. Use this simulator to prove your growth model is scalable before your next board meeting.
1. Growth Inputs
2. Economics Health
Gross Profit Lifetime
Cash Flow (J-Curve)
Cumulative Profit per CustomerBook a strategy call with a Fractional CPO.
Frequently Asked Questions
What is a unit economics simulator for SaaS? +
It is a quick model that estimates whether a customer is profitable, how long payback takes, and whether the business can scale efficiently. This tool focuses on the essentials, CAC, ARPU, churn, and gross margin.
What is a good LTV to CAC ratio for Series A or Series B SaaS? +
Many investors want to see LTV:CAC at or above 3.0 for scalable growth. Below that, you may still grow, but you are typically buying revenue inefficiently or losing too much value to churn or low margin.
How is customer LTV calculated in this tool? +
LTV is calculated as monthly gross profit divided by monthly churn. Monthly gross profit is ARPU multiplied by gross margin. If churn is high, LTV drops fast, even if ARPU looks strong.
What is a healthy CAC payback period? +
Many SaaS businesses target 12 months or less, especially in growth stages where cash efficiency matters. If payback is longer, you usually need higher margin, better retention, or a lower CAC to scale safely.
What should I enter for ARPU, average revenue per user? +
Use your current average monthly revenue per customer. If you have multiple plans, use a weighted average, or model your target segment ARPU if you are planning a positioning shift.
Can I use this for a board deck or investor update? +
Yes. Use the download button to export the J-curve chart, then include your inputs as assumptions. It is a clean way to show whether growth is efficient and how changes in churn or margin shift outcomes.